| BT25钛合金高温变形行为 |
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| 引用本文： | 程晨,雷旻,万明攀,蔡钢.BT25钛合金高温变形行为[J].有色金属科学与工程,2017,8(6):51-56. |
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| 作者姓名： | 程晨 雷旻 万明攀 蔡钢 |
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| 作者单位： | a.贵州大学，材料与冶金学院，贵阳 550025 |
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| 基金项目： | 贵州省科技厅工业攻关项目GY(2012)3002贵阳市科技局工业攻关项目[2012101]2-8 |
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| 摘 要： | 对BT25钛合金在温度为950~1 100 ℃，应变速率为0.001~10 s-1条件下的高温变形行为进行了研究，分析了热力学参数对流变应力和微观组织的影响，并以Arrhenius方程为基础，构建了本构方程，最后进行了验证.结果表明:BT25合金在相同温度和应变速率下变形，变形量越大，动态再结晶越充分并细化了晶粒.相同变形量，变形温度越低，应变速率越高，动态再结晶晶粒尺寸越细小；流变应力随应变速率的增加而增加，随变形温度的升高而减小；BT25合金在α+β两相区（950~1 010 ℃）Q=763.51 kJ/mol，β相区（1 040~1 100 ℃）Q=231.36 kJ/mol.
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| 关 键 词： | BT25钛合金 形变参数 动态再结晶 流变应力 |
| 收稿时间： | 2017-06-10 |
High temperature deformation behavior of BT25 titanium alloy |
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| Affiliation: | a.College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Chinab.Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guizhou University, Guiyang 550025, China |
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| Abstract: | The high temperature behavior of BT25 titanium alloy was investigated from 950 ℃ to 1 100 ℃ and strain rate range 0.001 s-1 to 10 s-1. The effects of thermodynamic parameters on flow stress and microstructure were analyzed. Based on the arrhenius equation, the constitutive equation was constructed and validated. The results show that at the same temperature and strain rate, the larger the deformation, the more the dynamic recrystallization is. At the same deformation degree, the lower the deformation temperature and higher the strain rate, thefiner the dynamic recrystallization grain size is. The flow stress increases with the increase of strain rate, and decreases with the rising deformation temperature. The deformation activation energy of BT25 titanium alloy is 763.51 kJ/mol in α+β phase region(950~1 010 ℃) and 231.36 kJ/mol in β phase region(1 040~1 100 ℃). |
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